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中文摘要：
采用大气等离子喷涂制备莫来石涂层，对涂层进行了热震试验。以OLYCIAm3图像分析软件测定涂层孔隙率，以MH-5-VM型显微硬度仪测定涂层硬度，依照ASTMC633—79标准测定涂层结合强度，以X射线衍射（XRD）和扫描电镜（SEM）表征涂层的相组成和微观形貌。结果表明，莫来石涂层主要由变形颗粒、未熔融粉末及少量孔隙组成，涂层中没有微观裂纹；涂层中含有莫来石晶体和部分非晶态玻璃相；热震过程中，涂层中的非晶转变为晶态莫来石，同时伴随应力释放，导致涂层出现微观裂纹。
英文摘要：
The mullite coatings were prepared by air plasma sprayed. The as-sprayed coating were carried out thermal shock experiment. The porosity and microhardness were measured by OLYCIA m3 image analysis software and MH-5-VM microhardness tester, respectively. The bond strength of mullite coatings were determined according to ASTM C633-79 standard. The composition and morphology of the mullite coatings were examined by X-ray diffraction （XRD） and scanning electron microscope（SEM）. The results show that as-sprayed coating includes splats grains, partially melted powders and a few pores. The microcracks do not appear in the coating. The as-sprayed coating is largely crystal mullite and only a small quantity of amorphous phase. During thermal shock experiment, amorphous phase in coating changes to crystal mullite and gives rise to stress, leading to microcracks.
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